Anti-slip sole for footwear



FIG. 1 is a perspective view of an anti-slip sole for footwear, showing my new design;

FIG. 2 is a side elevational view thereof; and

FIG. 3 is a bottom plan view thereof.

The top of the sole is flat and plain. 

The ornamental design for an anti-slip sole for footwear, as shown and described. 